The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 22, 1991
Filed:
Jun. 19, 1990
Yoshiyuki Kakuta, Saitama, JP;
Masatoshi Adachi, Saitama, JP;
Pioneer Electronic Corporation, Tokyo, JP;
Abstract
A light power control circuit by which a stable writing without any influence of a high-frequency current on writing data is enabled by performing superposition of the high-frequency signal on a drive current of a laser diode only during a reading mode, and by inhibiting the superposition of the high-frequency current during a writing mode. In a further embodiment having a construction in which a writing drive current is superposed on a reading drive signal in the form of pulses and a voltage proportional to a writing power is subtracted from an error signal in a servo system, an influences of a writing data component on the operation of the servo system is eliminated by effecting a level shift to the voltage by a predetermined level and subtracting the voltage after the level shift from the error signal.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile